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Trade and other receivables - Ageing of Trade Receivables and Other Financial Assets (Details) - Trade receivables - GBP (£)
£ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of financial assets [Line items]      
Financial assets £ 6,487 £ 7,055  
Gross trade receivables      
Disclosure of financial assets [Line items]      
Financial assets 6,522 7,099  
Expected credit losses      
Disclosure of financial assets [Line items]      
Financial assets (35) (44) £ (72)
0-30 days      
Disclosure of financial assets [Line items]      
Financial assets 572 612  
0-30 days | Gross trade receivables      
Disclosure of financial assets [Line items]      
Financial assets 572 613  
0-30 days | Expected credit losses      
Disclosure of financial assets [Line items]      
Financial assets 0 (1)  
31-90 days      
Disclosure of financial assets [Line items]      
Financial assets 155 182  
31-90 days | Gross trade receivables      
Disclosure of financial assets [Line items]      
Financial assets 155 183  
31-90 days | Expected credit losses      
Disclosure of financial assets [Line items]      
Financial assets 0 (1)  
91-180 days      
Disclosure of financial assets [Line items]      
Financial assets 56 50  
91-180 days | Gross trade receivables      
Disclosure of financial assets [Line items]      
Financial assets 58 53  
91-180 days | Expected credit losses      
Disclosure of financial assets [Line items]      
Financial assets (2) (3)  
181 days- 1 year      
Disclosure of financial assets [Line items]      
Financial assets 14 20  
181 days- 1 year | Gross trade receivables      
Disclosure of financial assets [Line items]      
Financial assets 23 30  
181 days- 1 year | Expected credit losses      
Disclosure of financial assets [Line items]      
Financial assets (9) (10)  
Greater than 1 year      
Disclosure of financial assets [Line items]      
Financial assets 19 19  
Greater than 1 year | Gross trade receivables      
Disclosure of financial assets [Line items]      
Financial assets 42 47  
Greater than 1 year | Expected credit losses      
Disclosure of financial assets [Line items]      
Financial assets (23) (28)  
Not past due      
Disclosure of financial assets [Line items]      
Financial assets 5,671 6,172  
Not past due | Gross trade receivables      
Disclosure of financial assets [Line items]      
Financial assets 5,672 6,173  
Not past due | Expected credit losses      
Disclosure of financial assets [Line items]      
Financial assets £ (1) £ (1)